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authorKurt Van Dijck <kurt.van.dijck@eia.be>2011-01-10 23:32:31 -0500
committerDavid S. Miller <davem@davemloft.net>2011-01-21 23:15:17 -0500
commit03fd3cf5a179da12e6bee5e9d74b648aff68dc4c (patch)
treeef8c801d7f07daa4af3cade721f9a99cffd2b0f8 /drivers/net/can
parent2221eca0a2c0f7f9918efdcaa52fb8e1adff991f (diff)
can: add driver for Softing card
This patch adds a driver for the platform:softing device. This will create (up to) 2 CAN network devices from 1 platform:softing device Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be> Acked-by: Wolfgang Grandegger <wg@grandegger.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/can')
-rw-r--r--drivers/net/can/Kconfig2
-rw-r--r--drivers/net/can/Makefile1
-rw-r--r--drivers/net/can/softing/Kconfig16
-rw-r--r--drivers/net/can/softing/Makefile5
-rw-r--r--drivers/net/can/softing/softing.h167
-rw-r--r--drivers/net/can/softing/softing_fw.c691
-rw-r--r--drivers/net/can/softing/softing_main.c893
-rw-r--r--drivers/net/can/softing/softing_platform.h40
8 files changed, 1815 insertions, 0 deletions
diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
index d5a9db60ade9..986195eaa57c 100644
--- a/drivers/net/can/Kconfig
+++ b/drivers/net/can/Kconfig
@@ -117,6 +117,8 @@ source "drivers/net/can/sja1000/Kconfig"
117 117
118source "drivers/net/can/usb/Kconfig" 118source "drivers/net/can/usb/Kconfig"
119 119
120source "drivers/net/can/softing/Kconfig"
121
120config CAN_DEBUG_DEVICES 122config CAN_DEBUG_DEVICES
121 bool "CAN devices debugging messages" 123 bool "CAN devices debugging messages"
122 depends on CAN 124 depends on CAN
diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile
index 07ca159ba3f9..53c82a71778e 100644
--- a/drivers/net/can/Makefile
+++ b/drivers/net/can/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_CAN_DEV) += can-dev.o
9can-dev-y := dev.o 9can-dev-y := dev.o
10 10
11obj-y += usb/ 11obj-y += usb/
12obj-y += softing/
12 13
13obj-$(CONFIG_CAN_SJA1000) += sja1000/ 14obj-$(CONFIG_CAN_SJA1000) += sja1000/
14obj-$(CONFIG_CAN_MSCAN) += mscan/ 15obj-$(CONFIG_CAN_MSCAN) += mscan/
diff --git a/drivers/net/can/softing/Kconfig b/drivers/net/can/softing/Kconfig
new file mode 100644
index 000000000000..072f337f42e3
--- /dev/null
+++ b/drivers/net/can/softing/Kconfig
@@ -0,0 +1,16 @@
1config CAN_SOFTING
2 tristate "Softing Gmbh CAN generic support"
3 depends on CAN_DEV
4 ---help---
5 Support for CAN cards from Softing Gmbh & some cards
6 from Vector Gmbh.
7 Softing Gmbh CAN cards come with 1 or 2 physical busses.
8 Those cards typically use Dual Port RAM to communicate
9 with the host CPU. The interface is then identical for PCI
10 and PCMCIA cards. This driver operates on a platform device,
11 which has been created by softing_cs or softing_pci driver.
12 Warning:
13 The API of the card does not allow fine control per bus, but
14 controls the 2 busses on the card together.
15 As such, some actions (start/stop/busoff recovery) on 1 bus
16 must bring down the other bus too temporarily.
diff --git a/drivers/net/can/softing/Makefile b/drivers/net/can/softing/Makefile
new file mode 100644
index 000000000000..7db04452deb6
--- /dev/null
+++ b/drivers/net/can/softing/Makefile
@@ -0,0 +1,5 @@
1
2softing-y := softing_main.o softing_fw.o
3obj-$(CONFIG_CAN_SOFTING) += softing.o
4
5ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/softing/softing.h b/drivers/net/can/softing/softing.h
new file mode 100644
index 000000000000..7ec9f4db3d52
--- /dev/null
+++ b/drivers/net/can/softing/softing.h
@@ -0,0 +1,167 @@
1/*
2 * softing common interfaces
3 *
4 * by Kurt Van Dijck, 2008-2010
5 */
6
7#include <linux/atomic.h>
8#include <linux/netdevice.h>
9#include <linux/ktime.h>
10#include <linux/mutex.h>
11#include <linux/spinlock.h>
12#include <linux/can.h>
13#include <linux/can/dev.h>
14
15#include "softing_platform.h"
16
17struct softing;
18
19struct softing_priv {
20 struct can_priv can; /* must be the first member! */
21 struct net_device *netdev;
22 struct softing *card;
23 struct {
24 int pending;
25 /* variables wich hold the circular buffer */
26 int echo_put;
27 int echo_get;
28 } tx;
29 struct can_bittiming_const btr_const;
30 int index;
31 uint8_t output;
32 uint16_t chip;
33};
34#define netdev2softing(netdev) ((struct softing_priv *)netdev_priv(netdev))
35
36struct softing {
37 const struct softing_platform_data *pdat;
38 struct platform_device *pdev;
39 struct net_device *net[2];
40 spinlock_t spin; /* protect this structure & DPRAM access */
41 ktime_t ts_ref;
42 ktime_t ts_overflow; /* timestamp overflow value, in ktime */
43
44 struct {
45 /* indication of firmware status */
46 int up;
47 /* protection of the 'up' variable */
48 struct mutex lock;
49 } fw;
50 struct {
51 int nr;
52 int requested;
53 int svc_count;
54 unsigned int dpram_position;
55 } irq;
56 struct {
57 int pending;
58 int last_bus;
59 /*
60 * keep the bus that last tx'd a message,
61 * in order to let every netdev queue resume
62 */
63 } tx;
64 __iomem uint8_t *dpram;
65 unsigned long dpram_phys;
66 unsigned long dpram_size;
67 struct {
68 uint16_t fw_version, hw_version, license, serial;
69 uint16_t chip[2];
70 unsigned int freq; /* remote cpu's operating frequency */
71 } id;
72};
73
74extern int softing_default_output(struct net_device *netdev);
75
76extern ktime_t softing_raw2ktime(struct softing *card, u32 raw);
77
78extern int softing_chip_poweron(struct softing *card);
79
80extern int softing_bootloader_command(struct softing *card, int16_t cmd,
81 const char *msg);
82
83/* Load firmware after reset */
84extern int softing_load_fw(const char *file, struct softing *card,
85 __iomem uint8_t *virt, unsigned int size, int offset);
86
87/* Load final application firmware after bootloader */
88extern int softing_load_app_fw(const char *file, struct softing *card);
89
90/*
91 * enable or disable irq
92 * only called with fw.lock locked
93 */
94extern int softing_enable_irq(struct softing *card, int enable);
95
96/* start/stop 1 bus on card */
97extern int softing_startstop(struct net_device *netdev, int up);
98
99/* netif_rx() */
100extern int softing_netdev_rx(struct net_device *netdev,
101 const struct can_frame *msg, ktime_t ktime);
102
103/* SOFTING DPRAM mappings */
104#define DPRAM_RX 0x0000
105 #define DPRAM_RX_SIZE 32
106 #define DPRAM_RX_CNT 16
107#define DPRAM_RX_RD 0x0201 /* uint8_t */
108#define DPRAM_RX_WR 0x0205 /* uint8_t */
109#define DPRAM_RX_LOST 0x0207 /* uint8_t */
110
111#define DPRAM_FCT_PARAM 0x0300 /* int16_t [20] */
112#define DPRAM_FCT_RESULT 0x0328 /* int16_t */
113#define DPRAM_FCT_HOST 0x032b /* uint16_t */
114
115#define DPRAM_INFO_BUSSTATE 0x0331 /* uint16_t */
116#define DPRAM_INFO_BUSSTATE2 0x0335 /* uint16_t */
117#define DPRAM_INFO_ERRSTATE 0x0339 /* uint16_t */
118#define DPRAM_INFO_ERRSTATE2 0x033d /* uint16_t */
119#define DPRAM_RESET 0x0341 /* uint16_t */
120#define DPRAM_CLR_RECV_FIFO 0x0345 /* uint16_t */
121#define DPRAM_RESET_TIME 0x034d /* uint16_t */
122#define DPRAM_TIME 0x0350 /* uint64_t */
123#define DPRAM_WR_START 0x0358 /* uint8_t */
124#define DPRAM_WR_END 0x0359 /* uint8_t */
125#define DPRAM_RESET_RX_FIFO 0x0361 /* uint16_t */
126#define DPRAM_RESET_TX_FIFO 0x0364 /* uint8_t */
127#define DPRAM_READ_FIFO_LEVEL 0x0365 /* uint8_t */
128#define DPRAM_RX_FIFO_LEVEL 0x0366 /* uint16_t */
129#define DPRAM_TX_FIFO_LEVEL 0x0366 /* uint16_t */
130
131#define DPRAM_TX 0x0400 /* uint16_t */
132 #define DPRAM_TX_SIZE 16
133 #define DPRAM_TX_CNT 32
134#define DPRAM_TX_RD 0x0601 /* uint8_t */
135#define DPRAM_TX_WR 0x0605 /* uint8_t */
136
137#define DPRAM_COMMAND 0x07e0 /* uint16_t */
138#define DPRAM_RECEIPT 0x07f0 /* uint16_t */
139#define DPRAM_IRQ_TOHOST 0x07fe /* uint8_t */
140#define DPRAM_IRQ_TOCARD 0x07ff /* uint8_t */
141
142#define DPRAM_V2_RESET 0x0e00 /* uint8_t */
143#define DPRAM_V2_IRQ_TOHOST 0x0e02 /* uint8_t */
144
145#define TXMAX (DPRAM_TX_CNT - 1)
146
147/* DPRAM return codes */
148#define RES_NONE 0
149#define RES_OK 1
150#define RES_NOK 2
151#define RES_UNKNOWN 3
152/* DPRAM flags */
153#define CMD_TX 0x01
154#define CMD_ACK 0x02
155#define CMD_XTD 0x04
156#define CMD_RTR 0x08
157#define CMD_ERR 0x10
158#define CMD_BUS2 0x80
159
160/* returned fifo entry bus state masks */
161#define SF_MASK_BUSOFF 0x80
162#define SF_MASK_EPASSIVE 0x60
163
164/* bus states */
165#define STATE_BUSOFF 2
166#define STATE_EPASSIVE 1
167#define STATE_EACTIVE 0
diff --git a/drivers/net/can/softing/softing_fw.c b/drivers/net/can/softing/softing_fw.c
new file mode 100644
index 000000000000..b520784fb197
--- /dev/null
+++ b/drivers/net/can/softing/softing_fw.c
@@ -0,0 +1,691 @@
1/*
2 * Copyright (C) 2008-2010
3 *
4 * - Kurt Van Dijck, EIA Electronics
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/firmware.h>
21#include <linux/sched.h>
22#include <asm/div64.h>
23
24#include "softing.h"
25
26/*
27 * low level DPRAM command.
28 * Make sure that card->dpram[DPRAM_FCT_HOST] is preset
29 */
30static int _softing_fct_cmd(struct softing *card, int16_t cmd, uint16_t vector,
31 const char *msg)
32{
33 int ret;
34 unsigned long stamp;
35
36 iowrite16(cmd, &card->dpram[DPRAM_FCT_PARAM]);
37 iowrite8(vector >> 8, &card->dpram[DPRAM_FCT_HOST + 1]);
38 iowrite8(vector, &card->dpram[DPRAM_FCT_HOST]);
39 /* be sure to flush this to the card */
40 wmb();
41 stamp = jiffies + 1 * HZ;
42 /* wait for card */
43 do {
44 /* DPRAM_FCT_HOST is _not_ aligned */
45 ret = ioread8(&card->dpram[DPRAM_FCT_HOST]) +
46 (ioread8(&card->dpram[DPRAM_FCT_HOST + 1]) << 8);
47 /* don't have any cached variables */
48 rmb();
49 if (ret == RES_OK)
50 /* read return-value now */
51 return ioread16(&card->dpram[DPRAM_FCT_RESULT]);
52
53 if ((ret != vector) || time_after(jiffies, stamp))
54 break;
55 /* process context => relax */
56 usleep_range(500, 10000);
57 } while (1);
58
59 ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
60 dev_alert(&card->pdev->dev, "firmware %s failed (%i)\n", msg, ret);
61 return ret;
62}
63
64static int softing_fct_cmd(struct softing *card, int16_t cmd, const char *msg)
65{
66 int ret;
67
68 ret = _softing_fct_cmd(card, cmd, 0, msg);
69 if (ret > 0) {
70 dev_alert(&card->pdev->dev, "%s returned %u\n", msg, ret);
71 ret = -EIO;
72 }
73 return ret;
74}
75
76int softing_bootloader_command(struct softing *card, int16_t cmd,
77 const char *msg)
78{
79 int ret;
80 unsigned long stamp;
81
82 iowrite16(RES_NONE, &card->dpram[DPRAM_RECEIPT]);
83 iowrite16(cmd, &card->dpram[DPRAM_COMMAND]);
84 /* be sure to flush this to the card */
85 wmb();
86 stamp = jiffies + 3 * HZ;
87 /* wait for card */
88 do {
89 ret = ioread16(&card->dpram[DPRAM_RECEIPT]);
90 /* don't have any cached variables */
91 rmb();
92 if (ret == RES_OK)
93 return 0;
94 if (time_after(jiffies, stamp))
95 break;
96 /* process context => relax */
97 usleep_range(500, 10000);
98 } while (!signal_pending(current));
99
100 ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
101 dev_alert(&card->pdev->dev, "bootloader %s failed (%i)\n", msg, ret);
102 return ret;
103}
104
105static int fw_parse(const uint8_t **pmem, uint16_t *ptype, uint32_t *paddr,
106 uint16_t *plen, const uint8_t **pdat)
107{
108 uint16_t checksum[2];
109 const uint8_t *mem;
110 const uint8_t *end;
111
112 /*
113 * firmware records are a binary, unaligned stream composed of:
114 * uint16_t type;
115 * uint32_t addr;
116 * uint16_t len;
117 * uint8_t dat[len];
118 * uint16_t checksum;
119 * all values in little endian.
120 * We could define a struct for this, with __attribute__((packed)),
121 * but would that solve the alignment in _all_ cases (cfr. the
122 * struct itself may be an odd address)?
123 *
124 * I chose to use leXX_to_cpup() since this solves both
125 * endianness & alignment.
126 */
127 mem = *pmem;
128 *ptype = le16_to_cpup((void *)&mem[0]);
129 *paddr = le32_to_cpup((void *)&mem[2]);
130 *plen = le16_to_cpup((void *)&mem[6]);
131 *pdat = &mem[8];
132 /* verify checksum */
133 end = &mem[8 + *plen];
134 checksum[0] = le16_to_cpup((void *)end);
135 for (checksum[1] = 0; mem < end; ++mem)
136 checksum[1] += *mem;
137 if (checksum[0] != checksum[1])
138 return -EINVAL;
139 /* increment */
140 *pmem += 10 + *plen;
141 return 0;
142}
143
144int softing_load_fw(const char *file, struct softing *card,
145 __iomem uint8_t *dpram, unsigned int size, int offset)
146{
147 const struct firmware *fw;
148 int ret;
149 const uint8_t *mem, *end, *dat;
150 uint16_t type, len;
151 uint32_t addr;
152 uint8_t *buf = NULL;
153 int buflen = 0;
154 int8_t type_end = 0;
155
156 ret = request_firmware(&fw, file, &card->pdev->dev);
157 if (ret < 0)
158 return ret;
159 dev_dbg(&card->pdev->dev, "%s, firmware(%s) got %u bytes"
160 ", offset %c0x%04x\n",
161 card->pdat->name, file, (unsigned int)fw->size,
162 (offset >= 0) ? '+' : '-', (unsigned int)abs(offset));
163 /* parse the firmware */
164 mem = fw->data;
165 end = &mem[fw->size];
166 /* look for header record */
167 ret = fw_parse(&mem, &type, &addr, &len, &dat);
168 if (ret < 0)
169 goto failed;
170 if (type != 0xffff)
171 goto failed;
172 if (strncmp("Structured Binary Format, Softing GmbH" , dat, len)) {
173 ret = -EINVAL;
174 goto failed;
175 }
176 /* ok, we had a header */
177 while (mem < end) {
178 ret = fw_parse(&mem, &type, &addr, &len, &dat);
179 if (ret < 0)
180 goto failed;
181 if (type == 3) {
182 /* start address, not used here */
183 continue;
184 } else if (type == 1) {
185 /* eof */
186 type_end = 1;
187 break;
188 } else if (type != 0) {
189 ret = -EINVAL;
190 goto failed;
191 }
192
193 if ((addr + len + offset) > size)
194 goto failed;
195 memcpy_toio(&dpram[addr + offset], dat, len);
196 /* be sure to flush caches from IO space */
197 mb();
198 if (len > buflen) {
199 /* align buflen */
200 buflen = (len + (1024-1)) & ~(1024-1);
201 buf = krealloc(buf, buflen, GFP_KERNEL);
202 if (!buf) {
203 ret = -ENOMEM;
204 goto failed;
205 }
206 }
207 /* verify record data */
208 memcpy_fromio(buf, &dpram[addr + offset], len);
209 if (memcmp(buf, dat, len)) {
210 /* is not ok */
211 dev_alert(&card->pdev->dev, "DPRAM readback failed\n");
212 ret = -EIO;
213 goto failed;
214 }
215 }
216 if (!type_end)
217 /* no end record seen */
218 goto failed;
219 ret = 0;
220failed:
221 kfree(buf);
222 release_firmware(fw);
223 if (ret < 0)
224 dev_info(&card->pdev->dev, "firmware %s failed\n", file);
225 return ret;
226}
227
228int softing_load_app_fw(const char *file, struct softing *card)
229{
230 const struct firmware *fw;
231 const uint8_t *mem, *end, *dat;
232 int ret, j;
233 uint16_t type, len;
234 uint32_t addr, start_addr = 0;
235 unsigned int sum, rx_sum;
236 int8_t type_end = 0, type_entrypoint = 0;
237
238 ret = request_firmware(&fw, file, &card->pdev->dev);
239 if (ret) {
240 dev_alert(&card->pdev->dev, "request_firmware(%s) got %i\n",
241 file, ret);
242 return ret;
243 }
244 dev_dbg(&card->pdev->dev, "firmware(%s) got %lu bytes\n",
245 file, (unsigned long)fw->size);
246 /* parse the firmware */
247 mem = fw->data;
248 end = &mem[fw->size];
249 /* look for header record */
250 ret = fw_parse(&mem, &type, &addr, &len, &dat);
251 if (ret)
252 goto failed;
253 ret = -EINVAL;
254 if (type != 0xffff) {
255 dev_alert(&card->pdev->dev, "firmware starts with type 0x%x\n",
256 type);
257 goto failed;
258 }
259 if (strncmp("Structured Binary Format, Softing GmbH", dat, len)) {
260 dev_alert(&card->pdev->dev, "firmware string '%.*s' fault\n",
261 len, dat);
262 goto failed;
263 }
264 /* ok, we had a header */
265 while (mem < end) {
266 ret = fw_parse(&mem, &type, &addr, &len, &dat);
267 if (ret)
268 goto failed;
269
270 if (type == 3) {
271 /* start address */
272 start_addr = addr;
273 type_entrypoint = 1;
274 continue;
275 } else if (type == 1) {
276 /* eof */
277 type_end = 1;
278 break;
279 } else if (type != 0) {
280 dev_alert(&card->pdev->dev,
281 "unknown record type 0x%04x\n", type);
282 ret = -EINVAL;
283 goto failed;
284 }
285
286 /* regualar data */
287 for (sum = 0, j = 0; j < len; ++j)
288 sum += dat[j];
289 /* work in 16bit (target) */
290 sum &= 0xffff;
291
292 memcpy_toio(&card->dpram[card->pdat->app.offs], dat, len);
293 iowrite32(card->pdat->app.offs + card->pdat->app.addr,
294 &card->dpram[DPRAM_COMMAND + 2]);
295 iowrite32(addr, &card->dpram[DPRAM_COMMAND + 6]);
296 iowrite16(len, &card->dpram[DPRAM_COMMAND + 10]);
297 iowrite8(1, &card->dpram[DPRAM_COMMAND + 12]);
298 ret = softing_bootloader_command(card, 1, "loading app.");
299 if (ret < 0)
300 goto failed;
301 /* verify checksum */
302 rx_sum = ioread16(&card->dpram[DPRAM_RECEIPT + 2]);
303 if (rx_sum != sum) {
304 dev_alert(&card->pdev->dev, "SRAM seems to be damaged"
305 ", wanted 0x%04x, got 0x%04x\n", sum, rx_sum);
306 ret = -EIO;
307 goto failed;
308 }
309 }
310 if (!type_end || !type_entrypoint)
311 goto failed;
312 /* start application in card */
313 iowrite32(start_addr, &card->dpram[DPRAM_COMMAND + 2]);
314 iowrite8(1, &card->dpram[DPRAM_COMMAND + 6]);
315 ret = softing_bootloader_command(card, 3, "start app.");
316 if (ret < 0)
317 goto failed;
318 ret = 0;
319failed:
320 release_firmware(fw);
321 if (ret < 0)
322 dev_info(&card->pdev->dev, "firmware %s failed\n", file);
323 return ret;
324}
325
326static int softing_reset_chip(struct softing *card)
327{
328 int ret;
329
330 do {
331 /* reset chip */
332 iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO]);
333 iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO+1]);
334 iowrite8(1, &card->dpram[DPRAM_RESET]);
335 iowrite8(0, &card->dpram[DPRAM_RESET+1]);
336
337 ret = softing_fct_cmd(card, 0, "reset_can");
338 if (!ret)
339 break;
340 if (signal_pending(current))
341 /* don't wait any longer */
342 break;
343 } while (1);
344 card->tx.pending = 0;
345 return ret;
346}
347
348int softing_chip_poweron(struct softing *card)
349{
350 int ret;
351 /* sync */
352 ret = _softing_fct_cmd(card, 99, 0x55, "sync-a");
353 if (ret < 0)
354 goto failed;
355
356 ret = _softing_fct_cmd(card, 99, 0xaa, "sync-b");
357 if (ret < 0)
358 goto failed;
359
360 ret = softing_reset_chip(card);
361 if (ret < 0)
362 goto failed;
363 /* get_serial */
364 ret = softing_fct_cmd(card, 43, "get_serial_number");
365 if (ret < 0)
366 goto failed;
367 card->id.serial = ioread32(&card->dpram[DPRAM_FCT_PARAM]);
368 /* get_version */
369 ret = softing_fct_cmd(card, 12, "get_version");
370 if (ret < 0)
371 goto failed;
372 card->id.fw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 2]);
373 card->id.hw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 4]);
374 card->id.license = ioread16(&card->dpram[DPRAM_FCT_PARAM + 6]);
375 card->id.chip[0] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 8]);
376 card->id.chip[1] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 10]);
377 return 0;
378failed:
379 return ret;
380}
381
382static void softing_initialize_timestamp(struct softing *card)
383{
384 uint64_t ovf;
385
386 card->ts_ref = ktime_get();
387
388 /* 16MHz is the reference */
389 ovf = 0x100000000ULL * 16;
390 do_div(ovf, card->pdat->freq ?: 16);
391
392 card->ts_overflow = ktime_add_us(ktime_set(0, 0), ovf);
393}
394
395ktime_t softing_raw2ktime(struct softing *card, u32 raw)
396{
397 uint64_t rawl;
398 ktime_t now, real_offset;
399 ktime_t target;
400 ktime_t tmp;
401
402 now = ktime_get();
403 real_offset = ktime_sub(ktime_get_real(), now);
404
405 /* find nsec from card */
406 rawl = raw * 16;
407 do_div(rawl, card->pdat->freq ?: 16);
408 target = ktime_add_us(card->ts_ref, rawl);
409 /* test for overflows */
410 tmp = ktime_add(target, card->ts_overflow);
411 while (unlikely(ktime_to_ns(tmp) > ktime_to_ns(now))) {
412 card->ts_ref = ktime_add(card->ts_ref, card->ts_overflow);
413 target = tmp;
414 tmp = ktime_add(target, card->ts_overflow);
415 }
416 return ktime_add(target, real_offset);
417}
418
419static inline int softing_error_reporting(struct net_device *netdev)
420{
421 struct softing_priv *priv = netdev_priv(netdev);
422
423 return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
424 ? 1 : 0;
425}
426
427int softing_startstop(struct net_device *dev, int up)
428{
429 int ret;
430 struct softing *card;
431 struct softing_priv *priv;
432 struct net_device *netdev;
433 int bus_bitmask_start;
434 int j, error_reporting;
435 struct can_frame msg;
436 const struct can_bittiming *bt;
437
438 priv = netdev_priv(dev);
439 card = priv->card;
440
441 if (!card->fw.up)
442 return -EIO;
443
444 ret = mutex_lock_interruptible(&card->fw.lock);
445 if (ret)
446 return ret;
447
448 bus_bitmask_start = 0;
449 if (dev && up)
450 /* prepare to start this bus as well */
451 bus_bitmask_start |= (1 << priv->index);
452 /* bring netdevs down */
453 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
454 netdev = card->net[j];
455 if (!netdev)
456 continue;
457 priv = netdev_priv(netdev);
458
459 if (dev != netdev)
460 netif_stop_queue(netdev);
461
462 if (netif_running(netdev)) {
463 if (dev != netdev)
464 bus_bitmask_start |= (1 << j);
465 priv->tx.pending = 0;
466 priv->tx.echo_put = 0;
467 priv->tx.echo_get = 0;
468 /*
469 * this bus' may just have called open_candev()
470 * which is rather stupid to call close_candev()
471 * already
472 * but we may come here from busoff recovery too
473 * in which case the echo_skb _needs_ flushing too.
474 * just be sure to call open_candev() again
475 */
476 close_candev(netdev);
477 }
478 priv->can.state = CAN_STATE_STOPPED;
479 }
480 card->tx.pending = 0;
481
482 softing_enable_irq(card, 0);
483 ret = softing_reset_chip(card);
484 if (ret)
485 goto failed;
486 if (!bus_bitmask_start)
487 /* no busses to be brought up */
488 goto card_done;
489
490 if ((bus_bitmask_start & 1) && (bus_bitmask_start & 2)
491 && (softing_error_reporting(card->net[0])
492 != softing_error_reporting(card->net[1]))) {
493 dev_alert(&card->pdev->dev,
494 "err_reporting flag differs for busses\n");
495 goto invalid;
496 }
497 error_reporting = 0;
498 if (bus_bitmask_start & 1) {
499 netdev = card->net[0];
500 priv = netdev_priv(netdev);
501 error_reporting += softing_error_reporting(netdev);
502 /* init chip 1 */
503 bt = &priv->can.bittiming;
504 iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
505 iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
506 iowrite16(bt->phase_seg1 + bt->prop_seg,
507 &card->dpram[DPRAM_FCT_PARAM + 6]);
508 iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
509 iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
510 &card->dpram[DPRAM_FCT_PARAM + 10]);
511 ret = softing_fct_cmd(card, 1, "initialize_chip[0]");
512 if (ret < 0)
513 goto failed;
514 /* set mode */
515 iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
516 iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
517 ret = softing_fct_cmd(card, 3, "set_mode[0]");
518 if (ret < 0)
519 goto failed;
520 /* set filter */
521 /* 11bit id & mask */
522 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
523 iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
524 /* 29bit id.lo & mask.lo & id.hi & mask.hi */
525 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
526 iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
527 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
528 iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
529 ret = softing_fct_cmd(card, 7, "set_filter[0]");
530 if (ret < 0)
531 goto failed;
532 /* set output control */
533 iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
534 ret = softing_fct_cmd(card, 5, "set_output[0]");
535 if (ret < 0)
536 goto failed;
537 }
538 if (bus_bitmask_start & 2) {
539 netdev = card->net[1];
540 priv = netdev_priv(netdev);
541 error_reporting += softing_error_reporting(netdev);
542 /* init chip2 */
543 bt = &priv->can.bittiming;
544 iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
545 iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
546 iowrite16(bt->phase_seg1 + bt->prop_seg,
547 &card->dpram[DPRAM_FCT_PARAM + 6]);
548 iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
549 iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
550 &card->dpram[DPRAM_FCT_PARAM + 10]);
551 ret = softing_fct_cmd(card, 2, "initialize_chip[1]");
552 if (ret < 0)
553 goto failed;
554 /* set mode2 */
555 iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
556 iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
557 ret = softing_fct_cmd(card, 4, "set_mode[1]");
558 if (ret < 0)
559 goto failed;
560 /* set filter2 */
561 /* 11bit id & mask */
562 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
563 iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
564 /* 29bit id.lo & mask.lo & id.hi & mask.hi */
565 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
566 iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
567 iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
568 iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
569 ret = softing_fct_cmd(card, 8, "set_filter[1]");
570 if (ret < 0)
571 goto failed;
572 /* set output control2 */
573 iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
574 ret = softing_fct_cmd(card, 6, "set_output[1]");
575 if (ret < 0)
576 goto failed;
577 }
578 /* enable_error_frame */
579 /*
580 * Error reporting is switched off at the moment since
581 * the receiving of them is not yet 100% verified
582 * This should be enabled sooner or later
583 *
584 if (error_reporting) {
585 ret = softing_fct_cmd(card, 51, "enable_error_frame");
586 if (ret < 0)
587 goto failed;
588 }
589 */
590 /* initialize interface */
591 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 2]);
592 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 4]);
593 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 6]);
594 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 8]);
595 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 10]);
596 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 12]);
597 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 14]);
598 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 16]);
599 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 18]);
600 iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 20]);
601 ret = softing_fct_cmd(card, 17, "initialize_interface");
602 if (ret < 0)
603 goto failed;
604 /* enable_fifo */
605 ret = softing_fct_cmd(card, 36, "enable_fifo");
606 if (ret < 0)
607 goto failed;
608 /* enable fifo tx ack */
609 ret = softing_fct_cmd(card, 13, "fifo_tx_ack[0]");
610 if (ret < 0)
611 goto failed;
612 /* enable fifo tx ack2 */
613 ret = softing_fct_cmd(card, 14, "fifo_tx_ack[1]");
614 if (ret < 0)
615 goto failed;
616 /* start_chip */
617 ret = softing_fct_cmd(card, 11, "start_chip");
618 if (ret < 0)
619 goto failed;
620 iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE]);
621 iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE2]);
622 if (card->pdat->generation < 2) {
623 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
624 /* flush the DPRAM caches */
625 wmb();
626 }
627
628 softing_initialize_timestamp(card);
629
630 /*
631 * do socketcan notifications/status changes
632 * from here, no errors should occur, or the failed: part
633 * must be reviewed
634 */
635 memset(&msg, 0, sizeof(msg));
636 msg.can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED;
637 msg.can_dlc = CAN_ERR_DLC;
638 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
639 if (!(bus_bitmask_start & (1 << j)))
640 continue;
641 netdev = card->net[j];
642 if (!netdev)
643 continue;
644 priv = netdev_priv(netdev);
645 priv->can.state = CAN_STATE_ERROR_ACTIVE;
646 open_candev(netdev);
647 if (dev != netdev) {
648 /* notify other busses on the restart */
649 softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
650 ++priv->can.can_stats.restarts;
651 }
652 netif_wake_queue(netdev);
653 }
654
655 /* enable interrupts */
656 ret = softing_enable_irq(card, 1);
657 if (ret)
658 goto failed;
659card_done:
660 mutex_unlock(&card->fw.lock);
661 return 0;
662invalid:
663 ret = -EINVAL;
664failed:
665 softing_enable_irq(card, 0);
666 softing_reset_chip(card);
667 mutex_unlock(&card->fw.lock);
668 /* bring all other interfaces down */
669 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
670 netdev = card->net[j];
671 if (!netdev)
672 continue;
673 dev_close(netdev);
674 }
675 return ret;
676}
677
678int softing_default_output(struct net_device *netdev)
679{
680 struct softing_priv *priv = netdev_priv(netdev);
681 struct softing *card = priv->card;
682
683 switch (priv->chip) {
684 case 1000:
685 return (card->pdat->generation < 2) ? 0xfb : 0xfa;
686 case 5:
687 return 0x60;
688 default:
689 return 0x40;
690 }
691}
diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c
new file mode 100644
index 000000000000..5157e15e96eb
--- /dev/null
+++ b/drivers/net/can/softing/softing_main.c
@@ -0,0 +1,893 @@
1/*
2 * Copyright (C) 2008-2010
3 *
4 * - Kurt Van Dijck, EIA Electronics
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/version.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/interrupt.h>
24
25#include "softing.h"
26
27#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
28
29/*
30 * test is a specific CAN netdev
31 * is online (ie. up 'n running, not sleeping, not busoff
32 */
33static inline int canif_is_active(struct net_device *netdev)
34{
35 struct can_priv *can = netdev_priv(netdev);
36
37 if (!netif_running(netdev))
38 return 0;
39 return (can->state <= CAN_STATE_ERROR_PASSIVE);
40}
41
42/* reset DPRAM */
43static inline void softing_set_reset_dpram(struct softing *card)
44{
45 if (card->pdat->generation >= 2) {
46 spin_lock_bh(&card->spin);
47 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
48 &card->dpram[DPRAM_V2_RESET]);
49 spin_unlock_bh(&card->spin);
50 }
51}
52
53static inline void softing_clr_reset_dpram(struct softing *card)
54{
55 if (card->pdat->generation >= 2) {
56 spin_lock_bh(&card->spin);
57 iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
58 &card->dpram[DPRAM_V2_RESET]);
59 spin_unlock_bh(&card->spin);
60 }
61}
62
63/* trigger the tx queue-ing */
64static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
65 struct net_device *dev)
66{
67 struct softing_priv *priv = netdev_priv(dev);
68 struct softing *card = priv->card;
69 int ret;
70 uint8_t *ptr;
71 uint8_t fifo_wr, fifo_rd;
72 struct can_frame *cf = (struct can_frame *)skb->data;
73 uint8_t buf[DPRAM_TX_SIZE];
74
75 if (can_dropped_invalid_skb(dev, skb))
76 return NETDEV_TX_OK;
77
78 spin_lock(&card->spin);
79
80 ret = NETDEV_TX_BUSY;
81 if (!card->fw.up ||
82 (card->tx.pending >= TXMAX) ||
83 (priv->tx.pending >= TX_ECHO_SKB_MAX))
84 goto xmit_done;
85 fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
86 fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
87 if (fifo_wr == fifo_rd)
88 /* fifo full */
89 goto xmit_done;
90 memset(buf, 0, sizeof(buf));
91 ptr = buf;
92 *ptr = CMD_TX;
93 if (cf->can_id & CAN_RTR_FLAG)
94 *ptr |= CMD_RTR;
95 if (cf->can_id & CAN_EFF_FLAG)
96 *ptr |= CMD_XTD;
97 if (priv->index)
98 *ptr |= CMD_BUS2;
99 ++ptr;
100 *ptr++ = cf->can_dlc;
101 *ptr++ = (cf->can_id >> 0);
102 *ptr++ = (cf->can_id >> 8);
103 if (cf->can_id & CAN_EFF_FLAG) {
104 *ptr++ = (cf->can_id >> 16);
105 *ptr++ = (cf->can_id >> 24);
106 } else {
107 /* increment 1, not 2 as you might think */
108 ptr += 1;
109 }
110 if (!(cf->can_id & CAN_RTR_FLAG))
111 memcpy(ptr, &cf->data[0], cf->can_dlc);
112 memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
113 buf, DPRAM_TX_SIZE);
114 if (++fifo_wr >= DPRAM_TX_CNT)
115 fifo_wr = 0;
116 iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
117 card->tx.last_bus = priv->index;
118 ++card->tx.pending;
119 ++priv->tx.pending;
120 can_put_echo_skb(skb, dev, priv->tx.echo_put);
121 ++priv->tx.echo_put;
122 if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
123 priv->tx.echo_put = 0;
124 /* can_put_echo_skb() saves the skb, safe to return TX_OK */
125 ret = NETDEV_TX_OK;
126xmit_done:
127 spin_unlock(&card->spin);
128 if (card->tx.pending >= TXMAX) {
129 int j;
130 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
131 if (card->net[j])
132 netif_stop_queue(card->net[j]);
133 }
134 }
135 if (ret != NETDEV_TX_OK)
136 netif_stop_queue(dev);
137
138 return ret;
139}
140
141/*
142 * shortcut for skb delivery
143 */
144int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
145 ktime_t ktime)
146{
147 struct sk_buff *skb;
148 struct can_frame *cf;
149
150 skb = alloc_can_skb(netdev, &cf);
151 if (!skb)
152 return -ENOMEM;
153 memcpy(cf, msg, sizeof(*msg));
154 skb->tstamp = ktime;
155 return netif_rx(skb);
156}
157
158/*
159 * softing_handle_1
160 * pop 1 entry from the DPRAM queue, and process
161 */
162static int softing_handle_1(struct softing *card)
163{
164 struct net_device *netdev;
165 struct softing_priv *priv;
166 ktime_t ktime;
167 struct can_frame msg;
168 int cnt = 0, lost_msg;
169 uint8_t fifo_rd, fifo_wr, cmd;
170 uint8_t *ptr;
171 uint32_t tmp_u32;
172 uint8_t buf[DPRAM_RX_SIZE];
173
174 memset(&msg, 0, sizeof(msg));
175 /* test for lost msgs */
176 lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
177 if (lost_msg) {
178 int j;
179 /* reset condition */
180 iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
181 /* prepare msg */
182 msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
183 msg.can_dlc = CAN_ERR_DLC;
184 msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
185 /*
186 * service to all busses, we don't know which it was applicable
187 * but only service busses that are online
188 */
189 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
190 netdev = card->net[j];
191 if (!netdev)
192 continue;
193 if (!canif_is_active(netdev))
194 /* a dead bus has no overflows */
195 continue;
196 ++netdev->stats.rx_over_errors;
197 softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
198 }
199 /* prepare for other use */
200 memset(&msg, 0, sizeof(msg));
201 ++cnt;
202 }
203
204 fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
205 fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
206
207 if (++fifo_rd >= DPRAM_RX_CNT)
208 fifo_rd = 0;
209 if (fifo_wr == fifo_rd)
210 return cnt;
211
212 memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
213 DPRAM_RX_SIZE);
214 mb();
215 /* trigger dual port RAM */
216 iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
217
218 ptr = buf;
219 cmd = *ptr++;
220 if (cmd == 0xff)
221 /* not quite usefull, probably the card has got out */
222 return 0;
223 netdev = card->net[0];
224 if (cmd & CMD_BUS2)
225 netdev = card->net[1];
226 priv = netdev_priv(netdev);
227
228 if (cmd & CMD_ERR) {
229 uint8_t can_state, state;
230
231 state = *ptr++;
232
233 msg.can_id = CAN_ERR_FLAG;
234 msg.can_dlc = CAN_ERR_DLC;
235
236 if (state & SF_MASK_BUSOFF) {
237 can_state = CAN_STATE_BUS_OFF;
238 msg.can_id |= CAN_ERR_BUSOFF;
239 state = STATE_BUSOFF;
240 } else if (state & SF_MASK_EPASSIVE) {
241 can_state = CAN_STATE_ERROR_PASSIVE;
242 msg.can_id |= CAN_ERR_CRTL;
243 msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
244 state = STATE_EPASSIVE;
245 } else {
246 can_state = CAN_STATE_ERROR_ACTIVE;
247 msg.can_id |= CAN_ERR_CRTL;
248 state = STATE_EACTIVE;
249 }
250 /* update DPRAM */
251 iowrite8(state, &card->dpram[priv->index ?
252 DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
253 /* timestamp */
254 tmp_u32 = le32_to_cpup((void *)ptr);
255 ptr += 4;
256 ktime = softing_raw2ktime(card, tmp_u32);
257
258 ++netdev->stats.rx_errors;
259 /* update internal status */
260 if (can_state != priv->can.state) {
261 priv->can.state = can_state;
262 if (can_state == CAN_STATE_ERROR_PASSIVE)
263 ++priv->can.can_stats.error_passive;
264 else if (can_state == CAN_STATE_BUS_OFF) {
265 /* this calls can_close_cleanup() */
266 can_bus_off(netdev);
267 netif_stop_queue(netdev);
268 }
269 /* trigger socketcan */
270 softing_netdev_rx(netdev, &msg, ktime);
271 }
272
273 } else {
274 if (cmd & CMD_RTR)
275 msg.can_id |= CAN_RTR_FLAG;
276 msg.can_dlc = get_can_dlc(*ptr++);
277 if (cmd & CMD_XTD) {
278 msg.can_id |= CAN_EFF_FLAG;
279 msg.can_id |= le32_to_cpup((void *)ptr);
280 ptr += 4;
281 } else {
282 msg.can_id |= le16_to_cpup((void *)ptr);
283 ptr += 2;
284 }
285 /* timestamp */
286 tmp_u32 = le32_to_cpup((void *)ptr);
287 ptr += 4;
288 ktime = softing_raw2ktime(card, tmp_u32);
289 if (!(msg.can_id & CAN_RTR_FLAG))
290 memcpy(&msg.data[0], ptr, 8);
291 ptr += 8;
292 /* update socket */
293 if (cmd & CMD_ACK) {
294 /* acknowledge, was tx msg */
295 struct sk_buff *skb;
296 skb = priv->can.echo_skb[priv->tx.echo_get];
297 if (skb)
298 skb->tstamp = ktime;
299 can_get_echo_skb(netdev, priv->tx.echo_get);
300 ++priv->tx.echo_get;
301 if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
302 priv->tx.echo_get = 0;
303 if (priv->tx.pending)
304 --priv->tx.pending;
305 if (card->tx.pending)
306 --card->tx.pending;
307 ++netdev->stats.tx_packets;
308 if (!(msg.can_id & CAN_RTR_FLAG))
309 netdev->stats.tx_bytes += msg.can_dlc;
310 } else {
311 int ret;
312
313 ret = softing_netdev_rx(netdev, &msg, ktime);
314 if (ret == NET_RX_SUCCESS) {
315 ++netdev->stats.rx_packets;
316 if (!(msg.can_id & CAN_RTR_FLAG))
317 netdev->stats.rx_bytes += msg.can_dlc;
318 } else {
319 ++netdev->stats.rx_dropped;
320 }
321 }
322 }
323 ++cnt;
324 return cnt;
325}
326
327/*
328 * real interrupt handler
329 */
330static irqreturn_t softing_irq_thread(int irq, void *dev_id)
331{
332 struct softing *card = (struct softing *)dev_id;
333 struct net_device *netdev;
334 struct softing_priv *priv;
335 int j, offset, work_done;
336
337 work_done = 0;
338 spin_lock_bh(&card->spin);
339 while (softing_handle_1(card) > 0) {
340 ++card->irq.svc_count;
341 ++work_done;
342 }
343 spin_unlock_bh(&card->spin);
344 /* resume tx queue's */
345 offset = card->tx.last_bus;
346 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
347 if (card->tx.pending >= TXMAX)
348 break;
349 netdev = card->net[(j + offset + 1) % card->pdat->nbus];
350 if (!netdev)
351 continue;
352 priv = netdev_priv(netdev);
353 if (!canif_is_active(netdev))
354 /* it makes no sense to wake dead busses */
355 continue;
356 if (priv->tx.pending >= TX_ECHO_SKB_MAX)
357 continue;
358 ++work_done;
359 netif_wake_queue(netdev);
360 }
361 return work_done ? IRQ_HANDLED : IRQ_NONE;
362}
363
364/*
365 * interrupt routines:
366 * schedule the 'real interrupt handler'
367 */
368static irqreturn_t softing_irq_v2(int irq, void *dev_id)
369{
370 struct softing *card = (struct softing *)dev_id;
371 uint8_t ir;
372
373 ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
374 iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
375 return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
376}
377
378static irqreturn_t softing_irq_v1(int irq, void *dev_id)
379{
380 struct softing *card = (struct softing *)dev_id;
381 uint8_t ir;
382
383 ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
384 iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
385 return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
386}
387
388/*
389 * netdev/candev inter-operability
390 */
391static int softing_netdev_open(struct net_device *ndev)
392{
393 int ret;
394
395 /* check or determine and set bittime */
396 ret = open_candev(ndev);
397 if (!ret)
398 ret = softing_startstop(ndev, 1);
399 return ret;
400}
401
402static int softing_netdev_stop(struct net_device *ndev)
403{
404 int ret;
405
406 netif_stop_queue(ndev);
407
408 /* softing cycle does close_candev() */
409 ret = softing_startstop(ndev, 0);
410 return ret;
411}
412
413static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
414{
415 int ret;
416
417 switch (mode) {
418 case CAN_MODE_START:
419 /* softing_startstop does close_candev() */
420 ret = softing_startstop(ndev, 1);
421 return ret;
422 case CAN_MODE_STOP:
423 case CAN_MODE_SLEEP:
424 return -EOPNOTSUPP;
425 }
426 return 0;
427}
428
429/*
430 * Softing device management helpers
431 */
432int softing_enable_irq(struct softing *card, int enable)
433{
434 int ret;
435
436 if (!card->irq.nr) {
437 return 0;
438 } else if (card->irq.requested && !enable) {
439 free_irq(card->irq.nr, card);
440 card->irq.requested = 0;
441 } else if (!card->irq.requested && enable) {
442 ret = request_threaded_irq(card->irq.nr,
443 (card->pdat->generation >= 2) ?
444 softing_irq_v2 : softing_irq_v1,
445 softing_irq_thread, IRQF_SHARED,
446 dev_name(&card->pdev->dev), card);
447 if (ret) {
448 dev_alert(&card->pdev->dev,
449 "request_threaded_irq(%u) failed\n",
450 card->irq.nr);
451 return ret;
452 }
453 card->irq.requested = 1;
454 }
455 return 0;
456}
457
458static void softing_card_shutdown(struct softing *card)
459{
460 int fw_up = 0;
461
462 if (mutex_lock_interruptible(&card->fw.lock))
463 /* return -ERESTARTSYS */;
464 fw_up = card->fw.up;
465 card->fw.up = 0;
466
467 if (card->irq.requested && card->irq.nr) {
468 free_irq(card->irq.nr, card);
469 card->irq.requested = 0;
470 }
471 if (fw_up) {
472 if (card->pdat->enable_irq)
473 card->pdat->enable_irq(card->pdev, 0);
474 softing_set_reset_dpram(card);
475 if (card->pdat->reset)
476 card->pdat->reset(card->pdev, 1);
477 }
478 mutex_unlock(&card->fw.lock);
479}
480
481static __devinit int softing_card_boot(struct softing *card)
482{
483 int ret, j;
484 static const uint8_t stream[] = {
485 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
486 unsigned char back[sizeof(stream)];
487
488 if (mutex_lock_interruptible(&card->fw.lock))
489 return -ERESTARTSYS;
490 if (card->fw.up) {
491 mutex_unlock(&card->fw.lock);
492 return 0;
493 }
494 /* reset board */
495 if (card->pdat->enable_irq)
496 card->pdat->enable_irq(card->pdev, 1);
497 /* boot card */
498 softing_set_reset_dpram(card);
499 if (card->pdat->reset)
500 card->pdat->reset(card->pdev, 1);
501 for (j = 0; (j + sizeof(stream)) < card->dpram_size;
502 j += sizeof(stream)) {
503
504 memcpy_toio(&card->dpram[j], stream, sizeof(stream));
505 /* flush IO cache */
506 mb();
507 memcpy_fromio(back, &card->dpram[j], sizeof(stream));
508
509 if (!memcmp(back, stream, sizeof(stream)))
510 continue;
511 /* memory is not equal */
512 dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
513 ret = -EIO;
514 goto failed;
515 }
516 wmb();
517 /* load boot firmware */
518 ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
519 card->dpram_size,
520 card->pdat->boot.offs - card->pdat->boot.addr);
521 if (ret < 0)
522 goto failed;
523 /* load loader firmware */
524 ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
525 card->dpram_size,
526 card->pdat->load.offs - card->pdat->load.addr);
527 if (ret < 0)
528 goto failed;
529
530 if (card->pdat->reset)
531 card->pdat->reset(card->pdev, 0);
532 softing_clr_reset_dpram(card);
533 ret = softing_bootloader_command(card, 0, "card boot");
534 if (ret < 0)
535 goto failed;
536 ret = softing_load_app_fw(card->pdat->app.fw, card);
537 if (ret < 0)
538 goto failed;
539
540 ret = softing_chip_poweron(card);
541 if (ret < 0)
542 goto failed;
543
544 card->fw.up = 1;
545 mutex_unlock(&card->fw.lock);
546 return 0;
547failed:
548 card->fw.up = 0;
549 if (card->pdat->enable_irq)
550 card->pdat->enable_irq(card->pdev, 0);
551 softing_set_reset_dpram(card);
552 if (card->pdat->reset)
553 card->pdat->reset(card->pdev, 1);
554 mutex_unlock(&card->fw.lock);
555 return ret;
556}
557
558/*
559 * netdev sysfs
560 */
561static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
562 char *buf)
563{
564 struct net_device *ndev = to_net_dev(dev);
565 struct softing_priv *priv = netdev2softing(ndev);
566
567 return sprintf(buf, "%i\n", priv->index);
568}
569
570static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
571 char *buf)
572{
573 struct net_device *ndev = to_net_dev(dev);
574 struct softing_priv *priv = netdev2softing(ndev);
575
576 return sprintf(buf, "%i\n", priv->chip);
577}
578
579static ssize_t show_output(struct device *dev, struct device_attribute *attr,
580 char *buf)
581{
582 struct net_device *ndev = to_net_dev(dev);
583 struct softing_priv *priv = netdev2softing(ndev);
584
585 return sprintf(buf, "0x%02x\n", priv->output);
586}
587
588static ssize_t store_output(struct device *dev, struct device_attribute *attr,
589 const char *buf, size_t count)
590{
591 struct net_device *ndev = to_net_dev(dev);
592 struct softing_priv *priv = netdev2softing(ndev);
593 struct softing *card = priv->card;
594 unsigned long val;
595 int ret;
596
597 ret = strict_strtoul(buf, 0, &val);
598 if (ret < 0)
599 return ret;
600 val &= 0xFF;
601
602 ret = mutex_lock_interruptible(&card->fw.lock);
603 if (ret)
604 return -ERESTARTSYS;
605 if (netif_running(ndev)) {
606 mutex_unlock(&card->fw.lock);
607 return -EBUSY;
608 }
609 priv->output = val;
610 mutex_unlock(&card->fw.lock);
611 return count;
612}
613
614static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
615static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
616static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
617
618static const struct attribute *const netdev_sysfs_attrs[] = {
619 &dev_attr_channel.attr,
620 &dev_attr_chip.attr,
621 &dev_attr_output.attr,
622 NULL,
623};
624static const struct attribute_group netdev_sysfs_group = {
625 .name = NULL,
626 .attrs = (struct attribute **)netdev_sysfs_attrs,
627};
628
629static const struct net_device_ops softing_netdev_ops = {
630 .ndo_open = softing_netdev_open,
631 .ndo_stop = softing_netdev_stop,
632 .ndo_start_xmit = softing_netdev_start_xmit,
633};
634
635static const struct can_bittiming_const softing_btr_const = {
636 .tseg1_min = 1,
637 .tseg1_max = 16,
638 .tseg2_min = 1,
639 .tseg2_max = 8,
640 .sjw_max = 4, /* overruled */
641 .brp_min = 1,
642 .brp_max = 32, /* overruled */
643 .brp_inc = 1,
644};
645
646
647static __devinit struct net_device *softing_netdev_create(struct softing *card,
648 uint16_t chip_id)
649{
650 struct net_device *netdev;
651 struct softing_priv *priv;
652
653 netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
654 if (!netdev) {
655 dev_alert(&card->pdev->dev, "alloc_candev failed\n");
656 return NULL;
657 }
658 priv = netdev_priv(netdev);
659 priv->netdev = netdev;
660 priv->card = card;
661 memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
662 priv->btr_const.brp_max = card->pdat->max_brp;
663 priv->btr_const.sjw_max = card->pdat->max_sjw;
664 priv->can.bittiming_const = &priv->btr_const;
665 priv->can.clock.freq = 8000000;
666 priv->chip = chip_id;
667 priv->output = softing_default_output(netdev);
668 SET_NETDEV_DEV(netdev, &card->pdev->dev);
669
670 netdev->flags |= IFF_ECHO;
671 netdev->netdev_ops = &softing_netdev_ops;
672 priv->can.do_set_mode = softing_candev_set_mode;
673 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
674
675 return netdev;
676}
677
678static __devinit int softing_netdev_register(struct net_device *netdev)
679{
680 int ret;
681
682 netdev->sysfs_groups[0] = &netdev_sysfs_group;
683 ret = register_candev(netdev);
684 if (ret) {
685 dev_alert(&netdev->dev, "register failed\n");
686 return ret;
687 }
688 return 0;
689}
690
691static void softing_netdev_cleanup(struct net_device *netdev)
692{
693 unregister_candev(netdev);
694 free_candev(netdev);
695}
696
697/*
698 * sysfs for Platform device
699 */
700#define DEV_ATTR_RO(name, member) \
701static ssize_t show_##name(struct device *dev, \
702 struct device_attribute *attr, char *buf) \
703{ \
704 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
705 return sprintf(buf, "%u\n", card->member); \
706} \
707static DEVICE_ATTR(name, 0444, show_##name, NULL)
708
709#define DEV_ATTR_RO_STR(name, member) \
710static ssize_t show_##name(struct device *dev, \
711 struct device_attribute *attr, char *buf) \
712{ \
713 struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
714 return sprintf(buf, "%s\n", card->member); \
715} \
716static DEVICE_ATTR(name, 0444, show_##name, NULL)
717
718DEV_ATTR_RO(serial, id.serial);
719DEV_ATTR_RO_STR(firmware, pdat->app.fw);
720DEV_ATTR_RO(firmware_version, id.fw_version);
721DEV_ATTR_RO_STR(hardware, pdat->name);
722DEV_ATTR_RO(hardware_version, id.hw_version);
723DEV_ATTR_RO(license, id.license);
724DEV_ATTR_RO(frequency, id.freq);
725DEV_ATTR_RO(txpending, tx.pending);
726
727static struct attribute *softing_pdev_attrs[] = {
728 &dev_attr_serial.attr,
729 &dev_attr_firmware.attr,
730 &dev_attr_firmware_version.attr,
731 &dev_attr_hardware.attr,
732 &dev_attr_hardware_version.attr,
733 &dev_attr_license.attr,
734 &dev_attr_frequency.attr,
735 &dev_attr_txpending.attr,
736 NULL,
737};
738
739static const struct attribute_group softing_pdev_group = {
740 .name = NULL,
741 .attrs = softing_pdev_attrs,
742};
743
744/*
745 * platform driver
746 */
747static __devexit int softing_pdev_remove(struct platform_device *pdev)
748{
749 struct softing *card = platform_get_drvdata(pdev);
750 int j;
751
752 /* first, disable card*/
753 softing_card_shutdown(card);
754
755 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
756 if (!card->net[j])
757 continue;
758 softing_netdev_cleanup(card->net[j]);
759 card->net[j] = NULL;
760 }
761 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
762
763 iounmap(card->dpram);
764 kfree(card);
765 return 0;
766}
767
768static __devinit int softing_pdev_probe(struct platform_device *pdev)
769{
770 const struct softing_platform_data *pdat = pdev->dev.platform_data;
771 struct softing *card;
772 struct net_device *netdev;
773 struct softing_priv *priv;
774 struct resource *pres;
775 int ret;
776 int j;
777
778 if (!pdat) {
779 dev_warn(&pdev->dev, "no platform data\n");
780 return -EINVAL;
781 }
782 if (pdat->nbus > ARRAY_SIZE(card->net)) {
783 dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
784 return -EINVAL;
785 }
786
787 card = kzalloc(sizeof(*card), GFP_KERNEL);
788 if (!card)
789 return -ENOMEM;
790 card->pdat = pdat;
791 card->pdev = pdev;
792 platform_set_drvdata(pdev, card);
793 mutex_init(&card->fw.lock);
794 spin_lock_init(&card->spin);
795
796 ret = -EINVAL;
797 pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
798 if (!pres)
799 goto platform_resource_failed;;
800 card->dpram_phys = pres->start;
801 card->dpram_size = pres->end - pres->start + 1;
802 card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
803 if (!card->dpram) {
804 dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
805 goto ioremap_failed;
806 }
807
808 pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
809 if (pres)
810 card->irq.nr = pres->start;
811
812 /* reset card */
813 ret = softing_card_boot(card);
814 if (ret < 0) {
815 dev_alert(&pdev->dev, "failed to boot\n");
816 goto boot_failed;
817 }
818
819 /* only now, the chip's are known */
820 card->id.freq = card->pdat->freq;
821
822 ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
823 if (ret < 0) {
824 dev_alert(&card->pdev->dev, "sysfs failed\n");
825 goto sysfs_failed;
826 }
827
828 ret = -ENOMEM;
829 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
830 card->net[j] = netdev =
831 softing_netdev_create(card, card->id.chip[j]);
832 if (!netdev) {
833 dev_alert(&pdev->dev, "failed to make can[%i]", j);
834 goto netdev_failed;
835 }
836 priv = netdev_priv(card->net[j]);
837 priv->index = j;
838 ret = softing_netdev_register(netdev);
839 if (ret) {
840 free_candev(netdev);
841 card->net[j] = NULL;
842 dev_alert(&card->pdev->dev,
843 "failed to register can[%i]\n", j);
844 goto netdev_failed;
845 }
846 }
847 dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
848 return 0;
849
850netdev_failed:
851 for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
852 if (!card->net[j])
853 continue;
854 softing_netdev_cleanup(card->net[j]);
855 }
856 sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
857sysfs_failed:
858 softing_card_shutdown(card);
859boot_failed:
860 iounmap(card->dpram);
861ioremap_failed:
862platform_resource_failed:
863 kfree(card);
864 return ret;
865}
866
867static struct platform_driver softing_driver = {
868 .driver = {
869 .name = "softing",
870 .owner = THIS_MODULE,
871 },
872 .probe = softing_pdev_probe,
873 .remove = __devexit_p(softing_pdev_remove),
874};
875
876MODULE_ALIAS("platform:softing");
877
878static int __init softing_start(void)
879{
880 return platform_driver_register(&softing_driver);
881}
882
883static void __exit softing_stop(void)
884{
885 platform_driver_unregister(&softing_driver);
886}
887
888module_init(softing_start);
889module_exit(softing_stop);
890
891MODULE_DESCRIPTION("Softing DPRAM CAN driver");
892MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
893MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/can/softing/softing_platform.h b/drivers/net/can/softing/softing_platform.h
new file mode 100644
index 000000000000..ebbf69815623
--- /dev/null
+++ b/drivers/net/can/softing/softing_platform.h
@@ -0,0 +1,40 @@
1
2#include <linux/platform_device.h>
3
4#ifndef _SOFTING_DEVICE_H_
5#define _SOFTING_DEVICE_H_
6
7/* softing firmware directory prefix */
8#define fw_dir "softing-4.6/"
9
10struct softing_platform_data {
11 unsigned int manf;
12 unsigned int prod;
13 /*
14 * generation
15 * 1st with NEC or SJA1000
16 * 8bit, exclusive interrupt, ...
17 * 2nd only SJA1000
18 * 16bit, shared interrupt
19 */
20 int generation;
21 int nbus; /* # busses on device */
22 unsigned int freq; /* operating frequency in Hz */
23 unsigned int max_brp;
24 unsigned int max_sjw;
25 unsigned long dpram_size;
26 const char *name;
27 struct {
28 unsigned long offs;
29 unsigned long addr;
30 const char *fw;
31 } boot, load, app;
32 /*
33 * reset() function
34 * bring pdev in or out of reset, depending on value
35 */
36 int (*reset)(struct platform_device *pdev, int value);
37 int (*enable_irq)(struct platform_device *pdev, int value);
38};
39
40#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-18 06:10:00 -0500